They say that the brain releases dopamine when X happens, or releases oxytocin when X happens, etc. How do we know that’s happening inside somebody’s head without cracking their skull open?
In: Biology
Almost everything is tested on rats, they are actually getting their heads open. Then they test stuff on people (volounteers who are getting paid for participating), and take samples of their blood, pee, cerebro-spinal fluid or whatever and they compare the blood samples before X happened, during the X happening, and after X happening, testing the levels of that exact chemical they were testing.
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